5 citations · 5 across the 3 of their papers we have counts for
9 papers
-isomorphisms associated with two projections on a Hilbert -module
Chunhong Fu, Qingxiang Xu, Guanjie Yan
Motivated by two norm equations used to characterize the Friedrichs angle, this paper studies -isomorphisms associated with two projections by introducing the matched triple a…
Some upper bounds for the -numerical radius of block matrices
Qingxiang Xu, Zhongming Ye, Ali Zamani
Let be the diagonal operator matrix determined by a positive bounded operator . For semi-H…
Numerical radius inequalities concerning with algebraic norms
A. Zamani, M. S. Moslehian, Q. Xu +1
We give an expression for a generalized numerical radius of Hilbert space operators and then apply it to obtain upper and lower bounds for the generalized numerical radius. We also…
Positivity of block matrices of operators
Mohammad Sal Moslehian, Mohsen Kian, Qingxiang Xu
We review some of the significant generalizations and applications of the celebrated Douglas theorem on the equivalence of factorization, range inclusion, and majorization of opera…
The polar decomposition for adjointable operators on Hilbert -modules and centered operators
Na Liu, Wei Luo, Qingxiang Xu
Let be an adjointable operator between two Hilbert -modules and be the adjoint operator of . The polar decomposition of is characterized as $T=U(T^*T)^\frac12…
The polar decomposition for adjointable operators on Hilbert -modules and -centered operators
Na Liu, Wei Luo, Qingxiang Xu
Let be any natural number. The -centered operator is introduced for adjointable operators on Hilbert -modules. Based on the characterizations of the polar decomposition…